CN105745992B - Synchronous circuit for powering to the double induction coil heating zones of cooktop surface - Google Patents
Synchronous circuit for powering to the double induction coil heating zones of cooktop surface Download PDFInfo
- Publication number
- CN105745992B CN105745992B CN201380081261.4A CN201380081261A CN105745992B CN 105745992 B CN105745992 B CN 105745992B CN 201380081261 A CN201380081261 A CN 201380081261A CN 105745992 B CN105745992 B CN 105745992B
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- China
- Prior art keywords
- microcontroller
- induction coil
- induction
- circuit
- cooktop surface
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
- H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
- H05B6/1272—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with more than one coil or coil segment per heating zone
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
- H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cookers (AREA)
- Induction Heating Cooking Devices (AREA)
Abstract
The present invention relates to a kind of induction heating cooktop surfaces (1), it has at least one twin coil heater (3) and the power circuit (4) for powering to above-mentioned twin coil heater (3), twin coil heater (3) is with toroidal inductor (9 inside and out taking, 10) induction coil of form concentrically disposed, above-mentioned power circuit (4) includes the rectifier (12) rectified to AC signal, with it is above-mentioned inside and out toroidal inductor (9, 10) associated filter circuit (F1, ) and inverter stage (S1 F2, S2), each inverter stage (S1, it S2) include annular switch arrangement (7 inside and out corresponding with the parallel connection of the freewheeling diode of reverse biased, 8).
Description
Technical field
The present invention relates to the synchronous circuits powered to the cooktop surface heating zone with double induction coils.
Background technique
It is well known that induction heating boiling vessel is transported based on by electromagnetic induction come the process heated to ferromagnetic material
Row, wherein by inducing eddy-current, and resistance provides above-mentioned ferromagnetic material, that is, takes the boiling vessel of the form of pot or pan
Heat dissipation in ware.
High-frequency alternating current is set to incude the magnetic field of identical frequency on the coil by coil by induction heating.It is flat
The internal resistance of bottom pot causes to radiate due to Joule effect, also, once removes pan from cooktop surface, just passes energy
Pass interruption.Heat-energy losses since there is no the transmitting of the thermal energy between brandreth and cooker, also, in air are minimum, thus feel
Answer the energy efficiency of heated steamer relatively high.
Controlled resonant converter in induction heater circuit topological structure is typically made of capacitor, inductor and resistance.
When supplying power to resonant tank, power storage is transferred to capacitor in inductor.Therefore, work as inductor and capacitor
When participating in energy exchange, there is resonance.Controlled resonant converter can be half bridge series resonance converter or quasi resonant convertor.
It is particularly due to simpler only with one compared with the more complicated half bridge series resonance converter of integrated operation
The circuit design of a electric power switch unit causes quasi resonant convertor to exhibit improvements over the certain excellent of half bridge series resonance converter
Point.In order to drive resonant inductor to generate magnetic field and the then inducing eddy-current in the skin depth of cooking utensil, correspondingly make
It is switched with the RF power of such as IGBT etc.
Known heating zone, which has more than one induction coil, so that Inside coil is surrounded by external coil.It removes
Except other, WO 2,010 037675 discloses that there are two the zone compositions of completely different induction coil by such tool
At the method for the heating zone with the induction coil concentrically disposed.WO 2,010 037675 discloses mutual to heating element
The system independently individually controlled.
Summary of the invention
On the other hand, the present invention provides the simpler and lower circuit scheme of cost, by the circuit scheme,
Single microcontroller in power circuit is for driving high frequency switching elements, to supply electricity to two induction coils.Due to this hair
Bright circuit scheme does not require the special high-cost multiphase PWM gate drive signal generated for triggering high-frequency component
Microcontroller, thus through the invention and with the more significantly lower mode of cost solve to expect due in a manner of asynchronous
The problem of synchronization for causing corresponding magnetic field to cancel one another to the process that two induction coils are powered and generating.
As defined in claim 1 provided by characteristic feature, the present invention provides induction heating cooktop surface, the induction
There is heating cooktop surface the improved and advantageously worthwhile induction coil for simultaneously concentrically disposing to two to power
Power circuit.
Main target of the invention is to provide worthwhile be used for simultaneously to two same centers of induction heating cooktop surface
The power circuit of the induction coil power supply of ground placement.
The invention proposes the induction heating cooktop surfaces with twin coil heater, and there are two senses for twin coil heater tool
Coil is answered, one in the two induction coils surrounds another.Power circuit includes two outputs for being connected to microcontroller
Pin it is corresponding inside and out annular IGBT and gate driving circuit.Above-mentioned gate driving circuit is configured in low logic shape
IGBT is driven under state.
Two output pins of microcontroller are connected by diode, so that when making above-mentioned diode forward bias,
Toroidal inductor is powered inside and out giving in a synchronous manner.In this case, the outer annular output of microcontroller
Pin is switched to high impedance mode.
Detailed description of the invention
Attached drawing only is provided merely for the purpose for illustrating circuit, hereinbefore outline circuit is better than the prior art
The advantages of, also, hereinafter will briefly explain these advantages.
Attached drawing is not intended to be limiting the protection scope as identified in claim, has not also should be explanation in aforesaid right
The range that is identified in it is required that and disclose just without recourse to the technology in description of the invention individually with reference to attached drawing.
Fig. 1 illustrates the generic representation of the cooktop surface according to the present invention with multiple heaters.
Fig. 2 illustrates the cooktop surface according to the present invention concentrically disposed with multiple heaters and two heaters
Generic representation.
Fig. 3 illustrates the circuit diagram of the power circuit of cooktop surface twin coil heater according to the present invention.
Fig. 4 illustrates ring switch element PWM inside and out the size according to the present invention depending on boiling container
The waveform of signal.
Fig. 5 illustrates the main algorithm of power supply program according to the present invention.
Number below is used in detailed description:
1. induction heating cooktop surface
2. cooktop surface heater
3. twin coil heater
4. power circuit
5. filter inductance
6. leveling capacitor
7. inner annular switching device
8. outer annular switching device
9. inner annular induction coil
10. outer annular induction coil
11. resonant capacitor
12. rectifier
13. synchronous circuit
14. microcontroller.
Specific embodiment
The invention proposes induction heating cooktop surface (1), typically have multiple individual with induction coil plus
Hot device (2).Induction heating cooktop surface (1) of the invention includes at least one twin coil heater (3), has and takes inner loop
Two induction coils of the form of shape induction coil and outer annular induction coil (respectively 9 and 10), to provide increased function
Rate output.Via two individual coils are synchronously supplied power to, to avoid the interference in two magnetic field, to provide increased function
Rate output.As will be hereinafter described, in this regard, power circuit (4) are proposed, by the power circuit in magnetic response
Thermal energy is incuded in formula boiling container.
AC voltage source is supplied to induction heating cooktop surface (1) of the invention.Full wave bridge rectifier (12) is connected to AC
Power supply with it is above-mentioned inside and out toroidal inductor (9,10) corresponding filter circuit (F1, F2) between.Two filtered electricals
Road (F1, F2) typically comprises leveling capacitor (6) and filter inductance at the output of above-mentioned full-wave rectifier (12)
(5)。
Toroidal inductor (9,10) is connected to the output of above-mentioned rectifier (12) and takes inside inside and out above-mentioned
And between the corresponding switching device (respectively 7 and 8) of the form of outer annular switching device.Resonant capacitor (11) is positioned to
With it is above-mentioned inside and out each of toroidal inductor (9,10) it is in parallel.Inside and out switching device (7,8) usually with
Anti-paralleled diode (that is, freewheeling diode) is connected in parallel.
The AC signal filter circuit (F1, F2) of power circuit (4) usually provides that the electric power by leveling capacitor (6) is used
In the purpose being filtered to high-frequency current.Switching device (7,8) is by the voltage of above-mentioned leveling capacitor (6) inside and out
It is transformed into square wave.According to Ampere's law, square wave provides resonance, to create around internal and outer annular induction coil (9,10)
Build magnetic field.Therefore, the inductive nature of resonant capacitor in parallel (11) compensation the latter.
Inside and out annular switch arrangement (7,8) be insulated gate bipolar transistor (IGBT).Quasi-resonance topological structure
Operation logic typically depend on will inside and out annular switch arrangement (7,8) connect when, energy is stored in inside
And the energy stores situation in outer annular induction coil (9,10), also, depend on and disconnected by above-mentioned electric power switch unit
When, energy is transferred to the energy transmission situation of digester or pan (P) from above-mentioned induction coil.More specifically, by phase
When the switching device answered disconnects, as corresponding resonant capacitor (11) is discharged, in collector node, resonance potential (that is,
The collector voltage of IGBT) increase.When resonance potential is equal to the rectified output voltage at input node, it is stored in corresponding
Induction coil in energy start to be transferred to resonant capacitor (11).When resonance potential reaches its maximum value, resonance current
Zero is gradually decreased to, which means that energy toroidal inductor (9,10) inside and out corresponding is transferred to accordingly
The process of resonant capacitor (11) terminates.With that is, resonant capacitor (11) starts to discharge energy to corresponding induction coil.Electricity
Stream is by completing current cycle by the freewheeling diode being connected in parallel with IGBT.In the collector voltage of IGBT, i.e. resonance
When voltage becomes negative, freewheeling diode is typically forward bias.
The invention proposes induction heating cooktop surface (1), have at least one twin coil heater (3) and for
The power circuit (4) of twin coil heater (3) power supply is stated, twin coil heater (3) is with toroidal inductive inside and out taking
The induction coil of the form of coil (9,10) concentrically disposed, above-mentioned power circuit (4) include whole to AC signal progress
The rectifier (12) of stream, with it is above-mentioned inside and out toroidal inductor (9,10) associated filter circuit (F1, F2) and
Inverter stage (S1, S2), each filter circuit (F1, F2) include filter inductance (5) and leveling capacitor (6), also, each inverse
Become device grade (S1, S2) include be positioned to it is above-mentioned inside and out toroidal inductor (9,10) parallel connection corresponding resonant capacitance
Device (11) and with switching device (7,8) inside and out in parallel corresponding of the freewheeling diode of reverse biased.
Above-mentioned power circuit (4) further includes microcontroller (14), and the microcontroller is by triggering corresponding gate driving electricity
Road (G1, G2) and the operation of switching device (7,8) inside and out above-mentioned is adjusted.Microcontroller according to the present invention
(14) have first and second output pin to generate pwm signal, to drive IGBT/gate (G1, G2).According to phase
The requirement of the power level setting of associated internal or external toroidal inductor (9,10) is correct in voltage magnitude and frequency
Reasonable time, microcontroller (14) trigger the driving circuit of IGBT with pwm signal.
According to the present invention, only in the pan more shorter than 240 mm by cooking utensil sensing circuit (not shown) sensing diameter
(P) in the case where, microcontroller (14) triggers the driving circuit of inner annular switching device (7).It is bigger flat detecting
In the case where pot (P), if power level is arranged to the level bigger than predefined level, also triggering outer annular is switched
Device (8).
Now, with reference to Fig. 4, if smaller pan (P) is detected, even if power level is arranged to than predefined
The higher level of level does not also connect outer annular switching device (8).In this case, as shown in Figure 4, external rings
It is 5V that shape, which controls signal, that is, does not trigger outer annular switching device (8), but is switched by PWM by inner annular switching device
(7) it switches on and off, exports 0V.Therefore, according to the present invention, in the corresponding internal or external annular switch arrangement (7,8) of driving
When, the output pin of microcontroller (14) is arranged lower (0V), and in the opposite case, it improves to 5V.As will below
Middle explanation, this advantageously provides the synchronization of two pwm signals in the case that two switching devices (7,8) are all triggered.Cause
This is switched only in the case where detecting bigger pan (P) and power level is bigger than scheduled threshold value by PWM
Annular switch arrangement (7,8) simultaneously switches on and off inside and out will be above-mentioned.It is not to make out in the case where other differences
It closes device (7,8) simultaneously to run, but keeps switching device (7,8) same based on power level setting and pan (P) size
Sample is individually run.
The present invention is using conventional general microcontroller, so that not relating to generate for triggering the more of high-frequency component
The special high-cost microcontroller of phase PWM gate drive signal just obtains improved circuit.For this purpose, microcontroller (14)
Two outputs are connected by diode (D5), are only in high impedance mode in the outer annular PWM pin of microcontroller (14)
When, make diode (D5) forward bias.Then, subsequent pin is made to be changed into input pin, and pullup resistor (R1) is typical
Ground is used to limit the amount for the electric current that can be flowed through.In this case, inside and out microcontroller (14) at annular pin
Two pwm signals become synchronous so that inner annular pwm signal is synchronously sent to outer annular switching device (8)
Driving circuit.Therefore, because the inner annular PWM pin when microcontroller (14) is still in low logic state and outer annular
When PWM pin is switched to high impedance mode, IGBT drive circuitry arrangement at triggering IGBT the fact that, realize with synchronous
Mode is to two induction coil (9,10) power supplies.
In brief, it proposes induction heating cooktop surface (1), induction heating cooktop surface (1) has at least one twin coil
Heater (3) and the power circuit (4) for being used to power to above-mentioned twin coil heater (3), twin coil heater (3), which has, to be taken
Inside and out toroidal inductor (9,10) form the induction coil concentrically disposed.By with microcontroller (14)
Two output pins be electrically communicated corresponding gate driving circuit (G1, G2) and trigger inside and out annular switch arrangement
(7,8).Inside and out the above-mentioned gate driving circuit (G1, G2) of annular switch arrangement (7,8) to be configured to triggering internal and outer
Portion's annular switch arrangement (7,8), and the corresponding output pin of microcontroller (14) is still in low logic state.
Two output pins of microcontroller (14) by diode (D5) connect so that only in response to will with it is above-mentioned
The output pin of outer annular induction coil (10) associated microcontroller (14) is transformed into high impedance mode and makes above-mentioned two
When pole pipe (D5) forward bias, toroidal inductor (9,10) power supply inside and out above-mentioned is simultaneously given.
It is opened it should be noted that synchronous circuit seen in Fig. 3 (13) does not allow to independently control two in a manner of simultaneously
It closes device (7,8).However, the operation algorithm powered to twin coil heater (3) of the invention advantageously provides for, only with Gao Gong
While rate level is arranged, in the case where detecting the presence of bigger pan (P) (diameter > 240mm), twin coil heater is given
(3) two coils are all powered.For this purpose, algorithm of the invention advantageously provide with to the other of the coil concentrically disposed
Adjust the similarly efficient power control for comparing and allowing power adjustment gradually.
Claims (4)
1. a kind of induction heating cooktop surface (1) has at least one twin coil heater (3) and for adding to the twin coil
The power circuit (4) of hot device (3) power supply, the twin coil heater (3) has take inside and out toroidal inductor (9,
10) induction coil of form concentrically disposed, the power circuit (4) includes the rectification rectified to AC signal
Device (12), filter circuit (F1, F2), the first inverter stage (S1) associated with inner annular induction coil (9), and
The second inverter stage (S2) associated with outer annular induction coil (10), first inverter stage (S1) include with
The inner annular switching device (7) of the freewheeling diode parallel connection of reverse biased, second inverter stage (S2) include with reversely
The outer annular switching device (8) of the freewheeling diode parallel connection of bias, the inner annular switching device (7) by with microcontroller
(14) first grid driving circuit (G1) triggering that two output pins are electrically communicated, the outer annular switching device (8)
It is special by being triggered with the second grid driving circuit (G2) of described two output pins of the microcontroller (14) electrical communication
Sign is,
First and second described gate driving circuit (G1, G2) of annular switch arrangement (7,8) is configured to inside and out described
When the corresponding output pin of the microcontroller (14) is kept in low logic state, trigger inside and out described respectively
Annular switch arrangement (7,8), also,
Described two output pins of the microcontroller (14) are connected by diode (D5), so that only in response to will be with
The output pin of the associated microcontroller (14) of outer annular induction coil (10) is transformed into high impedance mould
Formula and when making the diode (D5) forward bias, simultaneously to toroidal inductor (9,10) power supply inside and out described.
2. induction heating cooktop surface (1) according to claim 1, which is characterized in that in the filter circuit (F1, F2)
Each includes filter inductance (5) and leveling capacitor (6).
3. induction heating cooktop surface (1) according to claim 1 or 2, which is characterized in that first inverter stage
(S1) include resonant capacitor (11) with inner annular induction coil (9) arranged in parallel, and second inverter stage
(S2) include resonant capacitor (11) with outer annular induction coil (10) arranged in parallel.
4. induction heating cooktop surface (1) according to claim 1 or 2, which is characterized in that with the outer annular line of induction
The output pin of circle (10) associated described microcontroller (14) is connected to positive supply by pullup resistor (R1)
Voltage.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2013/070201 WO2015043650A1 (en) | 2013-09-27 | 2013-09-27 | Synchronization circuit for powering cooktop dual induction coil heating zone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105745992A CN105745992A (en) | 2016-07-06 |
| CN105745992B true CN105745992B (en) | 2019-02-22 |
Family
ID=49253312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380081261.4A Expired - Fee Related CN105745992B (en) | 2013-09-27 | 2013-09-27 | Synchronous circuit for powering to the double induction coil heating zones of cooktop surface |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3050398B1 (en) |
| CN (1) | CN105745992B (en) |
| WO (1) | WO2015043650A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2765498T3 (en) | 2016-03-04 | 2020-06-09 | Arcelik As | Induction heating cooker with dual coil heater and container detection method |
| WO2017149111A1 (en) | 2016-03-04 | 2017-09-08 | Arcelik Anonim Sirketi | Induction heating cooker with dual-coil heater and vessel detection method |
| WO2017174630A1 (en) | 2016-04-06 | 2017-10-12 | Arcelik Anonim Sirketi | Induction heating cooktop comprising a dual coil heating zone |
| EP3383131A1 (en) * | 2017-03-27 | 2018-10-03 | Vestel Elektronik Sanayi ve Ticaret A.S. | Inductive cooking device and method |
| US11219101B2 (en) * | 2018-05-03 | 2022-01-04 | Haier Us Appliance Solutions, Inc. | Induction cooking appliance having multiple heating coils |
| CN109442500A (en) * | 2018-07-06 | 2019-03-08 | 威海国电众美智能无辐射技术有限公司 | Integrated kitchen range |
| KR102525461B1 (en) * | 2018-08-09 | 2023-04-24 | 엘지전자 주식회사 | Induction heating device capable of reducing interference noise |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715256A (en) * | 2008-09-29 | 2010-05-26 | 日立空调·家用电器株式会社 | Electromagnetic induction heating device |
| CN102484907A (en) * | 2010-01-20 | 2012-05-30 | 松下电器产业株式会社 | Induction heating apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008042512A1 (en) | 2008-09-30 | 2010-04-01 | BSH Bosch und Siemens Hausgeräte GmbH | Hob and method for operating a hob |
| TWI403679B (en) * | 2010-04-15 | 2013-08-01 | Delta Electronics Inc | Heating apparatus having plurality of induction coils |
| EP2800454B1 (en) * | 2011-12-28 | 2016-03-16 | Panasonic Corporation | Induction heating cooker |
-
2013
- 2013-09-27 EP EP13766990.9A patent/EP3050398B1/en active Active
- 2013-09-27 CN CN201380081261.4A patent/CN105745992B/en not_active Expired - Fee Related
- 2013-09-27 WO PCT/EP2013/070201 patent/WO2015043650A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715256A (en) * | 2008-09-29 | 2010-05-26 | 日立空调·家用电器株式会社 | Electromagnetic induction heating device |
| CN102484907A (en) * | 2010-01-20 | 2012-05-30 | 松下电器产业株式会社 | Induction heating apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3050398B1 (en) | 2017-09-20 |
| CN105745992A (en) | 2016-07-06 |
| WO2015043650A1 (en) | 2015-04-02 |
| EP3050398A1 (en) | 2016-08-03 |
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Granted publication date: 20190222 Termination date: 20200927 |